JPS6416078A - Noise reduction circuit - Google Patents

Noise reduction circuit

Info

Publication number
JPS6416078A
JPS6416078A JP62171480A JP17148087A JPS6416078A JP S6416078 A JPS6416078 A JP S6416078A JP 62171480 A JP62171480 A JP 62171480A JP 17148087 A JP17148087 A JP 17148087A JP S6416078 A JPS6416078 A JP S6416078A
Authority
JP
Japan
Prior art keywords
circuit
coefficient
signal
noise level
video signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP62171480A
Other languages
Japanese (ja)
Inventor
Masami Itoga
Yoshiki Mizutani
Koichi Yamashita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP62171480A priority Critical patent/JPS6416078A/en
Publication of JPS6416078A publication Critical patent/JPS6416078A/en
Pending legal-status Critical Current

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Landscapes

  • Picture Signal Circuits (AREA)

Abstract

PURPOSE:To obtain a desired S/N at all times and to suppress after image efficiently by detecting a noise level during the vertical blanking period of a video signal and setting the coefficient of the block characteristic of the frequency characteristic depending on the detection level. CONSTITUTION:A coefficient setting circuit 12 sends a signal revising a coefficient K of a coefficient circuit 7 in response to an output signal of a noise level detection circuit 11. The coefficient setting circuit 12 gives a signal to increase the coefficient K of the circuit 7 when the noise level detection circuit 11 discriminates it that the noise level mixed in the video signal is large and the circuit 12 gives a signal to reduce the coefficient K of the circuit 7 when the circuit 11 discriminates it that the noise level mixed in the video signal is small. Thus, even if various video signals having different S/N fed to the input terminal 1, the noise signal is always suppressed with high performance and the after image is also suppressed effectively.
JP62171480A 1987-07-09 1987-07-09 Noise reduction circuit Pending JPS6416078A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62171480A JPS6416078A (en) 1987-07-09 1987-07-09 Noise reduction circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62171480A JPS6416078A (en) 1987-07-09 1987-07-09 Noise reduction circuit

Publications (1)

Publication Number Publication Date
JPS6416078A true JPS6416078A (en) 1989-01-19

Family

ID=15923885

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62171480A Pending JPS6416078A (en) 1987-07-09 1987-07-09 Noise reduction circuit

Country Status (1)

Country Link
JP (1) JPS6416078A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4926261A (en) * 1988-02-10 1990-05-15 Sony Corporation Video noise reduction circuit
US5325203A (en) * 1992-04-16 1994-06-28 Sony Corporation Adaptively controlled noise reduction device for producing a continuous output

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4926261A (en) * 1988-02-10 1990-05-15 Sony Corporation Video noise reduction circuit
US5325203A (en) * 1992-04-16 1994-06-28 Sony Corporation Adaptively controlled noise reduction device for producing a continuous output

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